Heat insulating tape



Sept. 6, 1938. J. M. WEAVER I 2,129,110

HEAT INSULATING TAPE Filed April 26. 19:57

Patented Sept. 6; 1938 UNITED STATES PATENT OFFICE HEAT INSULATING TAPE,

Application April 26, 1937, Serial No. 138,983

6 Claims.

This invention relates to improvements in thermal and waterproofedinsulation and method of making same, and more particularly to a heatinsulating tape or wrappingpadapted to be applied to pipes, conduits orcontainers, such as employed in heating, refrigerating and other fluidsystems in or through which fluids pass or are retained while maintainedunder relatively high or low temperatures.

10; Various forms of wrappings or tapes have heretofore been employedfor this purpose. These tapes usually comprise a body or core oiinsulating material enclosed in a jacket or sheath of fibrous textilematerial such as asbestos. Most of these tapes are so constructed thatwhen the jackets are usually applied with overlapping edges adhesivelyunited oi stitched together, the completed tape is rendered somewhatinflexible and does not permit it to properly adapt itself to wrappingaround pipes of small diameters without buckling. Moreover, there is atendency for the tape to buckle due to the inability of the Jacket orsheath to conform to the curvature of the pipe. This results in a veryinemcient insulation due to leakage between adjacent convolutions of thetapes, and the possibility of seepage of moisture between the tape andpipe or container. Furthermore, it is recognized as almost a physicalimpossibility to wrap insulating so tape around a pipe of small diameterso that adjacent convolutions abut sumciently tight to provide a sealagainst leakageof heat and also prevent moisture from seeping under thetape.

Cine of the objects of this invention is to pro vide a novel andimproved insulation of the character indicated, that edectivelyeliminates the foregoing dimculties.

Another object is to provide an improved insulating tape that isflexible and capable of readily adapting itself to contours of pipes ofsmall diameters without buckling. l

A further object resides in the provision of an improved insulating tapecharacterized by a sheath or jacket of fibrous fabric cut on the bias topermit the tape to readily adapt itselif to prop or use on pipes ofsmall diameters.

Still another object is to provide an improved insulating tape having aJacket of fibrous fabric formed with overlappingedges to form a lateralto extension to serve as a sealing flap upon which the next convolutionof tape is wrapped, to effectively prevent leakage of heat and seepageof moisture to the interior of the tape.

As a still further object of this invention, the

55 body oi the tape includes a plurality of spaced- (Cl. lit-4t) apartlongitudinally extending strands of asbestos yarn or cord around whichis wrapped adhesively united thereto, a soft flexible asbestos roving.This construction is such as to prevent collapsing or displacement ofthe component parts 5 either in the process of being encased in a jacketor sheath, or during its application to a pipe, conduit or container. 1

Other objects and advantages will be apparent from the followingdescription, taken in conneo- 10 tion with the accompanying drawing inwhich:

Fig. l is an elevational view of a section of pipe covered by theinsulating tape constituting the present invention.

Fig. 2 is a fragmentary face view of a piece of 15 the tape, parts beingbroken away to show details of construction.

Fig. 3 is a transverse section through the tape, f taken as indicated atline 3-3 on Fig. 2.

In the illustrated embodiment of my invention 20 the tape designated atIll, is shown spirally wrapped around a section of pipe H, containingfluids of relatively high or relatively low temperatures. Although thetape is shown applied to a pipe, it is to be understood that it isequally suit as able for use with containers, and various forms ofreceptacles.

The tape comprises a flat elongated body composed .of a plurality(herein shown as three) spaced apart substantially parallel,longitudinah 3o 1y extending strands it, of asbestos yarn or cord aroundwhich is spirally wound a soft asbestos roving it. The roving isadhesively united to the asbestos strands to produce a firm but flexiblebody, and which facilitates the application 35 of an amusing jacket orsheath it.

In forming the body the strands I! of yarn or cord are drawn through areceptacle containing suitable adhesive, such as. liquid rubber latex,or a rubber compound, or silicate of soda, and the 40 coated strandsthen engage suitable means for removing the excess quantity of adhesive.lie the adhesive is still in tacky condition they are maintained undertension in parallel spacedapart relation, and constitute the core aroundwhich is spirally wound the soft loosely fashioned asbestos roving itwhich becomes adhesively attached to the strands. An insulating bodythus formed possesses the characteristic of firmness, and flexibilitywhich permits it to be hellcally 5o wound in a manner that avoidsdistortion by compression and buckling.

The sheath It, is formed from a strip 01 asbestos cloth, wrapped aroundthe insulating body and is of such size that marginal edges areoverlapped beyond the longitudinal edge of the; body. and adhesivelyunited together to form a sealing flap It. To positively insure againstseparation of the marginal edges, due to excessive heat, said edges areadditionally secured together by a row of stitching ll, with asbestosthread. When the tape provided with this form of jacket is applied, thesealing flap ll oi one convolution of the tape overlaps the nextadjacent convolution, as seen in dotted outline in Fig. 3, to form anefflcient seal against the escape of heat, end else prevents seep-ace ofmoisture under time tape. This con struction facilitates the applicationof the tape and due to the novel form of insulating ioody permits it toreadily conform to curved surfaces of pipes oi even relatively smalldiameter.

In some tapes as heretofore constructed, the

sheath is stitched intermediate the longitudinal edges, which result inneedle punctures in the fabric. it has been found that in suchconstructions capillary action would conduct water through the needlepunctures and thereby cause the body of the tagoe to become moist; thisoccurs particularly when the pipe or container is out of service, andbecomes cold and. Wet. 'Ifliis dimculty is completely obviated by theform of sheath above described.

The asbestos cloth forming the sheath is out on a bias so as to furtherenable the tape to readily adapt itself to a pipe, container, etc, as itavoids stresses being set up in the sheath.

When it is desired that the tape also possess watetpi'ooflngcharactetistics, the asbestos cloth constituting the sheath it, may becoated on one side with waterproofing material, such as rubber compound,such as indicated at it, on the inner side of the sheath, oi" theasbestos strip may be cut from asbestos cloth so coated. it is to beunderstood, however, that i do not intend to restrict this, invention tothe form of sheath herein disclosed, as manifestly a variety of sheathsor jackets may be employeci, such as a sheath woven or braided directlyaround the insulating body, or a sheath folded or around the body.

The insulating body constituting this invention, one to its firm,flexible character, may also be used as an insulating tape without beingencased in a sheath. For silo-"n purpose the insulating body, which initselil oecornes the tape ce spirally wrapped around the pine,container, etc, and ii desired may be protected by a suitable covering,which may consist of asbestos woven tape, a jacket of asoestosclotli, asheet metal jacket, or it may be covered by a cloth sewed or aioanootherwise secured thereon. If desired, such a covering may be coated orpainted to render, it impervious to moisture.

Although I have herein disclosed certain embodiments of my invention,manifestly it is capabio of modification and rearrangement withoutdeparting from the spirit and scope thereof. 1 do not, therefore, wishto be Luiderstood as limiting the invention to the precise disclosuresherein, except as it may be so limited in the appended claims. I

I claim as my invention:

1. An insulating tape adapted to be wrapped about a pipe, conduit orcontainer, comprising a. plurality of speced-apart longitudinallyextend= ins strands 'or cords, and soft material wound around saidstrands.

2. An insulating tape adapted f" rapped about a pipe, conduit orcontainer, co icing a plurality of spaced-apart longitudinallyciitendlng strands or cords, and soft asbestos materiel spirally woundaround said strands.

3. An insulating tape adapted to be wrapped about a pipe, conduit orcontainer, comprising a plurality of spaced-apart longitudinallyextending stranm of asbestos yarn or cord, and soft asbestos materialwound around and adhesively united to said strands.

An insulating tape adapted to be wrapped about a. pipe, conduit orcontainer, comprising a plurality of spacezi-apart longitudinallyextending strands of asbestos grain or cord, and soft asbestos materialwound spirally around adhesively united to said strands.

5. An insulating tape to be wrapped about a pipe, conduit or containei',comprising an elongated body including a plu ality of spaced apartlongitudinally attending strands end soft asbestos materiel spirallywound atomic; strands, and a jacket for enclosing the body formed ofasbestos cloth having edges extending laterally beyond the edge of thebody in overlapping relation and adheslvely united together,

overlapping edges of the locket being additionally secured by stitchingwith asbestos thread.

e. An insulating adanted to be wrapped about a pine, conduit orcontainer, comprising an elongated oocly including a plurality of spacede oart longitudinally extending strands of asbestos yarn or cord, and asott asoestosrotlng wound. spirally around said strands, and an asbestosjacket enclosin said body, said locket being formed of cloth out on abias.

JESSE M. WEAVER.

